A friend of mine usually stays with the same tai sabaki throughout a class and varies the techniques, OR sticks with a single technique from every attack. He sometimes closes a class with an exercise from Yoseikan called "shita randori" (sp?). He will put a student in the middle of the mat and he will require the student to do any technique from a single attack without repeating, or require a single technique from any attack. Both are fun and a great way to finish a class.